I split my DD's 4 month old immunisations so that she wasn't hit by it all at once. When DS had his 4 year old shots, they did knock him around and I think it was the tetanus that hurt his arm for a few days. Wished I'd split his across a few weeks. I'm pro-vax but don't want to get into a debate on here, just letting you know that you can split some of the immunisations (not sure if Council run clinics would do this, but the nurse at my local GP did).